Furnace door



H. B. ABEL FURNACE DOOR May 3l, l1932.

Original Filed Sept. 30, 1930 NNN, ////l l/ VVI/ INVENTOR HB.A-lrel,

ATTORNEY WITNESSES x Patented May 31, 1932 UNITED STATES PATENT OFFICE HARRY B. ABEL, F MACON, GEORGIA, ASSIGNOR TO NYE ODORLESS INCINERATOR CORPORATION, OF MACON, GEORGIA, A CORPORATION OF DELAWARE FURNACE DOOR Original application iled September 30, 1930, Serial No.7485,523. Divided and this application led September 26, 1931.

This invention relates to furnace doors described and claimed in my co-pending application, Ser. No. 485,523 for incinerators, filed September 30, 1930, of which this application is a division.

It has been proposed to line the wallsof openings leading to furnace doors with metal plates but due to the intense heat the metal becomes warped with the direction of the warp- 1^ ing being inwardly from the bricks or masonry and this warping often becomes so acute that the door openings are partially closed and thus obstruct the normal movement of the doors. The space provided by the warping of the metal liners provides a passage for the iiame and heated gas and a receptacle for clinkers so that the brick work or masonry is destroyed at this point.

An object of the invention is to provide a door opening having the wall of the opening lined with metal in such a manner that the metal will not warp away from the masonry.

A further object of the invention is the provision of a door opening in which the walls i of the opening through the masonry or brick work are curved outwardly and lined with similarly curved metal plates so that the metal liner will tend to move outwardly rather than inwardly of the opening.

This invention will be best understood from a consideration of the following detailed description, in view of the accompanying drawings forming a part of the specification; nevertheless, it is to be understood that the invention is not confined to the disclosure, being susceptible of such changes and modifications which shall define no material departure from the salient features of the invention as expressed in the appended claims. Y

Figure l is a vertical transverse section of a doorway constructed in accordance with the principles of my invention;

Fig. 2 is a vertical section in elevation taken along the line 2--2 of Fig. 1;

Serial N'o. 565,380.

Fig. 3 is a horizontal section taken along the line 3 3 of Fig. 1;

Fig. i is a view in elevation of the doorway from the inside of the furnace.

Referring more particularly to the drawings, 10 designates an upper opening and 11 a lower opening` in a front wall 12 of the incinerator described and claimed in my copending application noted above. The walls 12 may be formed of lire brick or any other material suitable for the purpose. It will be noted that the side walls 13 of the opening 10 are curved or bowed outwardly and a metal liner 14 which is curved in accordance with the curvature in the side walls 13 is applied to the walls and maintained in place in any approved manner.

A keystone 15 formed of any suitable material is located at the top of the opening 10 and the inner face is curved as shown at 16. A metal liner 17 neatly its the curved inner surface 16 and conforms to the curvature of the inner upper face of the opening 10.

It will be noted from Fig. 3 that the side walls of the opening 10 and the metal liner 14 are bowed outwardly only at their inner edges next to the re. The outer side edges are straight asshown at 27. This type of construction not only preserves the usual straight vertical sides of the door but makes the whole structure stronger and more rigid. The inner edges of the metal liners 14 which are exposed to suliicient heat to cause ordinarily warping or buckling of the liners in this case retain their shape due to the curvature and direction of curvature of the liners.

A metal plate 22 forms a floor of the opening in passage 10 and is provided with a central opening 23 which is normally closed by a dead plate 24 hinged at 25 on lugs 26 depending from the bottom face of the outer portion of the floor or metal plate 22.k

A door 3() is mounted for swinging movement at theouter end of the opening 10 for normally closing the opening or passage.

The inner end of the metal plate or floor 22 Where the same projects into the furnace proper is provided with a depending lip 31 adapted to receive the outer end of a grate not shown.

The opening 1l which leads intothe ash pit of the incinerator is closed by a door 32 which is swingably supported in any approved manner and normally maintains the passage or opening closed. rIhe portion of` 4lines kin Fig. lit will deposit the cinders and other matter upon the ioor 34 of the passage 11 which leads into the ash pit.

The construction defined above with the referenceto the. passageI 10 shows the side walls of said passage bowed outwardly, and lined with metal while the upper wall is curved and also lined with metal so that when the temperature of the furnace becomes sufciently great to cause expansion of the metal liners 14 and .17 the metal liners will tend to bow inthe direction of the curvature of the liners and thus prevent the liners from moving inwardlyand tending to close the passage y10. Furthermore, these liners will maintain Aa tight fit with the curved side walls and thus prevent ashes, flame and hot gases from coming iny contact with the masonry forming the curved side walls and top of kthe passage 10.

The upper edges and the lower edges of the metal liners 14 are located in substantially the samevertical plane. The front edges 27 .of said liners are substantially straight whiletherear.edges are curved as shown at 28..

The metal liners 14 and 17 form respectively thesidejambs and the top j amb. The curvature of the jambs 14 vary from the front tov Ythe rear or inner ends so that the greatest curvatureof the jambs will be at their inner edges adjacent the fire chamber. In other words, the curvature of the concave side jambs decrease vfrom the rear or inner edges towards the front edges.

I claim:

l. In a furnace with masonry walls, a

metal lined doorway having concave side:

jamb-s, the curvature of said jambs varying ffromfront torear and the greatest curvature of each` such jamb being at its rear edge 2. In a furnace with masonry walls, a metal lineddoorway-y having concave side` jambs, thetop edge ofeach ,jamb being in vertical alinement with the bottonnedgeV thereof.`

3. In a furnace with masonry walls, a metal lined doorway having concave side jambs, the top edge of each j amb being in alinement with the bottom edge thereof, and the curvature of each j amb decreasing from the rear edge toward the front edge.

4. In a furnace with masonry walls, a metal lined doorway having concave side jambs, the curvature of each jamb decreasing from the rear edge toward the front edge.

5. 4In a furnace with masonry walls, a metal lined doorway having concave side jambs, the curvature of each jam decreasing from the rear edge toward the front edge, and said front edge being vertical..

HARRY B. ABEL. 

